tests: store: unit test for secure_unlink
tests: store: unit test for secure_unlink

conorsch/securedrop,heartsucker/securedrop,micahflee/securedrop,ageis/securedrop,garrettr/securedrop,conorsch/securedrop,heartsucker/securedrop,garrettr/securedrop,conorsch/securedrop,micahflee/securedrop,ageis/securedrop,conorsch/securedrop,micahflee/securedrop,ageis/securedrop,ehartsuyker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,micahflee/securedrop,garrettr/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,ageis/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,heartsucker/securedrop